Please advise how PQR can generate one IID and one B3 for all the purchases of 5 vendors as the material is coming under one CCN?

Please advise how PQR can generate one IID and one B3 for all the purchases of 5 vendors as the material is coming under one CCN?

If user have 5 vendors and each of them has their own invoice, they will declare all under Invoice Tab. There will be a total 5 Invoice List on their declaration under 1 CCN and Transaction.